One of my favorite sci-fi takes on a modern weapon that I thought you might appreciate, the modified AK-47/AKM in the movie Elysium .
The modified AK-47/AKM takes inspiration from the XM-25 experimental airburst grenade launcher. It has a fictional attachment that combines a holosight, targeting laser, and rangefinder into an advanced targeting system. This targeting system links up with fictional airburst ammunition, programming the distance at which the round will detonate based on the range from the target. Each round has a kill radius of 5 meters, giving each about the equivalent explosive force of your average modern day 40mm grenade round. As demonstrated in the gif, this enables the modified AK-47/AKM to tear enemies apart, whether organic or robotic.
I’m not a huge fan of the AK, but this is perhaps one of my top favorite ballistic science fiction weapons, because it takes an already iconic rifle, and turns it into an absolute monster in an time setting where it is probably almost 200 years old, but without dramatically leaving the realm of realistic possibility in my opinion.
Such an interesting concept, and so easily overlooked during the film itself!